Abstract
Sleep apnea disrupts physiologic homeostasis and causes neuronal dysfunction. In addition to signs of mental disorders and cognitive dysfunction, patients with sleep apnea have a higher anxiety rate. Here, we examined the mechanisms underlying this critical health issue. We used a mouse model with sleep-associated chronic intermittent hypoxia (IH) to verify the effects of sleep apnea on neuronal dysfunction. To evaluate how IH alters neuronal function to yield anxiety-like behavior and cognitive dysfunction, we examined synaptic plasticity and neuronal inflammation in related brain areas, including the medial prefrontal cortex (mPFC), striatum, and hippocampus. Mice subjected to chronic IH for 10 days exhibited significant anxiety-like behaviors in the elevated plus maze test. IH mice spent less travel time in open arms and more travel time in enclosed arms compared to control mice. However, cognitive impairment was minimal in IH mice. Increased glutamate N-methyl-D-aspartate (NMDA) receptor subunits 2B (GluN2B) and phosphorylated-ERK1/2 were seen in the mPFC, striatum, and hippocampus of IH mice, but no significant microglial and astrocyte activation was found in these brain areas. Chronic IH in mice induced compensatory increases in GluN2B to disturb neuronal synaptic plasticity, without neuronal inflammation. The altered synaptic plasticity subsequently led to anxiety-like behavior in mice. Treatment with the NMDA receptor antagonist dextromethorphan attenuated chronic IH-induced anxiety-like behavior and GluN2B expression. Our findings provide mechanistic evidence of how IH may provoke anxiety and support for the importance of early intervention to alleviate anxiety-associated complications in patients with chronic sleep apnea.
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Data Availability
All authors have ensured that all data and materials support the published statement and comply with field standards. The datasets generated during or analyzed during the current study are available from the corresponding author on reasonable request.
Code Availability
The software (Panlab Smart video-tracking software, version 3.0, OLYMPUS cellSens Dimension version 1.13., Prism 5 and SPSS 22) that were used in this study have authorized by the original company.
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The authors thank Rebecca Bartow, PhD, of the Department of Scientific Publications at the Texas Heart Institute, Houston, Texas, for editorial assistance.
Funding
This study was supported by grant M109108 (to SLC) from Kaohsiung Medical University and the grants #105-2628-B-037-003-MY3 (to SLC) and #107-2321-B-037-002 (to CKL) from the Taiwan Ministry of Science and Technology.
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Yun Fa and Mei-Chuan Chou performed most of the experiments; Yen-Chin Liu, Ching-Kuan Liu, and Chu-Huang Chen helped with the parts of the experiments and revised the manuscript; Yun Fa, Mei-Chuan Chou, and Shiou-Lan Chen designed the study, analyzed the data, and wrote the manuscript. All authors read and approved the final manuscript.
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All animal experiments were approved by the Institutional Animal Care and Use Committee (IACUC) of the Kaohsiung Medical University and carried out in accordance with AAALAC regulations, the US Department of Agriculture Animal Welfare Act, and the Guide for the Care and Use of Laboratory Animals of the NIH.
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Fan, Y., Chou, MC., Liu, YC. et al. Intermittent Hypoxia Activates N-Methyl-D-Aspartate Receptors to Induce Anxiety Behaviors in a Mouse Model of Sleep-Associated Apnea. Mol Neurobiol 58, 3238–3251 (2021). https://doi.org/10.1007/s12035-021-02321-0
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DOI: https://doi.org/10.1007/s12035-021-02321-0